# What is the volume of 45 grams of H_2 gas at STP?

$\text{Volume} > 500 \cdot L$. We use the molar volume of an Ideal gas at STP.
It is known that at STP, 1 mol of Ideal gas occupies a volume of $22.4$ $L$.
Thus $V$ $=$ (45*cancelg)/(2*cancelg*cancel(mol^-1)) xx 22.4*L*cancel(mol^-1 $=$ ??L